package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import utils.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("utf-8");
        String action = req.getParameter("action");
        if ("list".equals(action)) {
            // 接收参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            String currentPage = req.getParameter("currentPage");
            if (currentPage == null) {
                currentPage = "1";
            }

            int int_currentPage = Integer.parseInt(currentPage);
            Page page = new Page();


            User condition = new User(name, pass);
            // 查询总记录数
            int totalCount = userService.count(condition);

            // 绑定page相关参数
            page.setTotalCount(totalCount);
            page.setCurrentPage(int_currentPage);
            page.setTotalPage();

            // 计算偏移量
            int offset = (int_currentPage - 1) * page.getPageSize();



            List<User> users = userService.findAll(condition,offset,page.getPageSize());
            // 把数据放到请求域中
            req.setAttribute("users", users);
            req.setAttribute("condition", condition);
            req.setAttribute("page", page);
            // 在哪个页面显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        } else if ("add".equals(action)) {
            // 接受参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            int result = userService.addUser(new User(name, pass));
            if (result > 0) {
                // 使用重定向
                resp.sendRedirect("user?action=list");
            }

        } else if ("delete".equals(action)) {
            // 接受参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            int result = userService.deleteUserById(id);
            if (result > 0) {
                // 使用重定向
                resp.sendRedirect("user?action=list");
            }
        } else if ("toupdate".equals(action)) {
            // 接收参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            User user = userService.findUserById(id);
            // 把数据放到请求域中
            req.setAttribute("user", user);
            // 在哪个页面显示数据
            req.getRequestDispatcher("/update.jsp").forward(req, resp);
        } else if ("update".equals(action)) {
            // 接收参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id, name, pass));
            if (result > 0) {
                // 使用重定向
                resp.sendRedirect("user?action=list");
            }
        }
    }
}
